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Battery Runtime Calculator — Wh/Ah, Load, DoD & Efficiency

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Battery rating Battery capacity Voltage (V, for Ah mode) Average load (W) Usable depth of discharge (%) Use the battery/manufacturer value appropriate to your scenario.Conversion efficiency (%) Include inverter/DC conversion losses here.

Calculated result

2.88 h

Nameplate energy: 1,200 Wh

Ideal runtime: 4 h

Usable energy after DoD and efficiency: 864 Wh

Adjusted runtime: 172.8 min

Show the working

1. Use entered nameplate energy = 1,200 Wh.
2. Usable Wh = 1,200 × 0.8 × 0.9 = 864 Wh.
3. Runtime = 864 ÷ 300 = 2.88 h.

Real runtime varies with battery chemistry, discharge rate, temperature, age, voltage cutoffs, inverter standby loss and changing load.

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